I loved him.
I did read about Susan Boyle having a surprisingly great voice before I actually saw her perform on the show a couple of years ago, so the surprise factor was somewhat lost on me. To me,
When I heard Leona Lewis' Run start playing, I thought, "Oh, I really like this song. I hope he can pull it off." But then when he started singing Old McDonald with the tune, I was really surprised. I couldn't stop smiling. To me, it felt like the Susan Boyle surprise element, (which was originally lost on me because I happened to read in the newspapers that she surprised everyone with her good voice before I actually saw her perform). So I now have some idea on what that feels like.
On top of that, he did have a great voice. I hope he does really well in the show.